Agitator



June 4, 1929. J. E. BOND 1,716,297

AGITATOR Filed March 5, 1928 Patented June d, I929.

image? PATENT @FFICE.

JOSEPH E. BOND, 0E APPLETON, WISCONSIN.

AGITATOR.

Application filed March 5, 1928. 86118.1 No. 259,085. I

My invention relates to the art of paper making and particularly tomeans for agitating paper pulp.

In the development of the art it has been found possible to greatlyincrease the capacity of a given equipment b increas ng the density (or,in other wor s, lessening the fluidity) of the pulp during its treatmentpreceding delivery to the Fourdriniers. While in the old practice a 2pulp was considered proper and of the maximum density possible, it isnow common to deal with 6% solutions, with correspondingly increasedproduction capacity.

However, many difficult problems are encountered in handling pulp ofthis density due to its lack of fluidity and its tendency to mass orcake in the storage or treatment tanks and containers. This tendency is1nherent in the nature of the material under treatment due to itsfibrous character and to the physical law of attraction of sol ds. Theliquid within which the sollds are carried serves merely as a supportingmedium therefor and facilitates rather than hinders the massing andintertwining of the fibers.

To avoid massing and stratifying of the pulp in the liquid and tomaintain a uniform density throughout the entire body of material itmust be kept in motion and the motion producing means should have atendency to break up and tear apart any large or small masses of pulp.In the old practice the mixture was kept in motion by means of paddlesor impellers in this tank, but this apparatus had very little tendencyto break up masses of pulp, and was wholly lneiiective with stock ofincreased density. Furthermore, such apparatus required an outlay ofpower not commensurate with the results secured.

The tanks, chests or containers which are in place and must be utilizedfor the new plan of operation are of many and varied forms, all of greatsize, some narrow and of great length, some deep and some round. Theproblem has been, therefore, to provide means applicable to thesevarious forms of tanks that would insure effective circulation, thebreaking up of pulp masses and the maintenance at all times of a properconsistency throughout the whole volume of material, with a minimum ofpower expend1- ture.

My invention will be more readily understood by reference to drawing, inwhich- Fig. 1 is a plan view of an agitator arrapiged in accordance withmy invention, an

Fig. 2 is a longitudinal sectional view on the line 22 of Fig. 1.

In the drawings I have illustrated a substantially square tank ofrelatively great size and have provided means for adequate agitation andcirculation of liquid without the use of any internal battles ordivision walls. The tank comprises side walls 10, 11 and end walls-12,13. Three pumps 14, 15, 16 are positioned outside of the end Wall 13 andare operated by suitable motors. Each pump has a plurality of inlet ipes17 communicating with the interior 0 the tank through the end wall atsubstantially the level of the floor. The material received throughthese pipes passes through the screw pump and is discharged upwardlythrough the pipe 18 and thence horizontally through the pipe 19 to thefar end of the tank where the pipe 19 terminates in a T, 20, and anozzle 21. Thus the entire body of material within the tank is agitatedand kept in constant circulation by means of the pumps and the deliverypipes shown. This design is particularly applicable to large tanks inwhich division walls are undesirable.

I claim:

1. In combination, a substantially square tank, a plurality of pumpseach pump' having a plurality of inlet connections with a low level ofsaid tank, and a discharge delivery pipe connected to each pump andextending horizontally within said tank to a point near the far endthereof.

2. In combination, a substantially square the accompanying tank, aplurality of pumps each pump havlivery pipe connected to each pump andex- 1 tending horizontally within said tank to a point near the far endthereof, said discharge pipes terminating in a plurality of the pump andextending longitudinally nozzles arranged to deliver material inopwithin the chest to a oint near the far end posite directions. of thechest, said pipe terminating in a 10 4. In combination, a chest, aplurality of plurality of oppositely directed outlets. 5 umps locatedexteriorly thereof, each pump In testimony whereof I have afiixed myhaving an inlet at substantially the level of signature. the chestfloor, a delivery pipe connected to JOSEPH E. BOND.

